I read the articles linked in the post. As mentioned there a lot of times, the new Windows shell and the new Polaris core OS will support win32 apps one way or another(either via virtualization or natively).
I don't think the market is already at the point where 32bit apps will go extinct. There are a lot of users out there still using 32bit OS and apps. I agree with Pete's opinion that such a move would be quite premature at this point.
Remember how long were the 16bit apps supported by 32bit OS? It's not easy to force the market to do such transitions.